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Suggestion: expose potmeter on openservo connector

 
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ahoeben



Joined: 20 Jun 2008
Posts: 20

PostPosted: Wed Feb 25, 2009 12:50 pm    Post subject: Suggestion: expose potmeter on openservo connector Reply with quote

For a future revision of the open servo design, it might be a nice idea to expose the potmeter signal (POSITION) and the regulated power (VREG) on the external connector. There's a couple of spare GND pins that could be repurposed.

Two usage scenarios:
* externally monitoring the potmeter value
handy for debugging, or for systems where you want continuous feedback of the servo position but don't want to overcrowd the I2C bus.

* connecting an external potmeter
eg one of these 'babies':
http://servocity.com/html/spg755a_standard_rotation.html
Also interesting to connect two fixed resistors for endless servos.

Having VREG available might be interesting for other uses near the servo as well.
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Holtsmark



Joined: 30 Oct 2008
Posts: 4

PostPosted: Sat Feb 28, 2009 8:40 pm    Post subject: Reply with quote

I second this suggestion.
My reason: Not all potentiometers will have the same cramped pin layout which is currently available on the V3, and the holes are far to small to solder in wires. We have found that one should not go below AWG 22 for automotive / rough / vibration-prone systems. There is no way I can connect AWG 22 directly to those holes.
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ginge
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Joined: 14 Jan 2006
Posts: 1029
Location: Manchester, UK

PostPosted: Wed Mar 04, 2009 7:09 pm    Post subject: Reply with quote

Hi,

Not sure how many of the GND connection we can take away before we start to limit the amount of current we can shunt. I will do some calculations on this, but I think we should be okay there.

I agree that the holes are too small... This is something we will be addressing on the next revision of OpenServo.
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